Question

A test cross is performed by crossing an F\(_1\) individual with

• A. Homozygous dominant parent
• B. Heterozygous parent
• C. Recessive parent
• D. Any parent

Hint:

Important Crosses: \[ \boxed{\text{Test Cross} = \text{Unknown} \times \text{Homozygous Recessive}} \] \[ \boxed{\text{Back Cross} = F_1 \times \text{Either Parent}} \] Every test cross is a back cross, but every back cross is not a test cross.

Answer 1

The Correct Option is C

Step 1: Recall the definition of a test cross. A test cross is used to determine the genotype of an individual showing a dominant phenotype.

Step 2: Identify the crossing partner. The individual of unknown genotype is crossed with: \[ \boxed{\text{Homozygous Recessive Parent}} \]

Step 3: Understand its purpose. If the unknown individual is heterozygous, both dominant and recessive phenotypes appear in the offspring. If it is homozygous dominant, all offspring show the dominant phenotype. Thus, \[ \boxed{\text{Test Cross = F}_1 \times \text{Recessive Parent}} \] Therefore, \[ \boxed{\text{(C)}} \] is the correct answer.